Dishes sparkle bright and clean the day you buy them, but over time they develop an unattractive white haze that makes them look older. Consumer Reports tested numerous additives and found three that worked to restore your dishes to newness once more.

Glisten Dishwasher Cleaner & Hard Water Spot Remover, Lemi Shine Original, and Finish Power Up Booster Agent (with some adjustments to the directions) all succeeded in eliminating buildup on dishes. Consumer Reports elaborates:

When we used the same amount of each product—about 50 grams—all removed the haze from our glassware and cleaned the dishwasher. But if you follow Finish's directions for machines with a prewash-detergent dispenser, as we did at first, you could be disappointed. If your dispenser holds far less than 50 grams, as ours did, the product won't work nearly as well. Indeed, even after running a second cycle with the Finish additive, we saw very little improvement. Only the third time, when we placed 2 tablespoons directly into the bottom of the dishwasher (following instructions for machines without a prewash dispenser), did the glassware and dishwasher tub come clean. Glisten and Lemi Shine did their job as directed, though you may need a second wash cycle to eliminate buildup fully.

So if you want to see your dishes look as good as new, those are the additives to buy.